Aleph 5 6o W
The room I am listening in is 22X14 fot
Polks Ls 15 are about 87 dB at one W this would give 105 dB at 64 W which is plenty loud I think but no head room.. Got to borrow the sound level meter from work and try and see what I am getting out of the Kandy I am using at present...

My tinking is 60 W may be enoug especialy considering the kind of power suply (600VA Trany) in Nelson amps.

As i said the 25 W sudgen sounded ok but could not cope, 3 more dB out of a 50 W maybe is a good start.

You will need almost a 1KW to get 105 db @ a listening distance of 9ft from that speaker......With 64 Watts you will get 93 db...

Figure on 81-82 db nominal in order to have good transients and dynamics from 64 watts .......

grollins is not monitoring this frequency, if you have questions not answered on this board note my id, most questions can be answered by remaining participants(us). if you want the full experience, build small to get a feel for the vibe and then upscale to the Burning Amp level...Roast a few transistors

Your Guidance Councilor, E

__________________
"Lead me not into temptation...I can find it myself."

Don't rule out the A75 just because it is an old design -- it is an amazing sounding amp. It uses some of the coolest design tricks too, such as the folded cascode second stage. It uses many of the same mosfets still in use today in many of Nelson's great amps.